code: def test_small_horizon_import():
      from dipy.viz import horizon as Horizon
  
      if has_fury:
          assert Horizon == horizon
      else:
          npt.assert_raises(ImportError, Horizon)
  
file_path: dipy/dipy/viz/tests/test_apps.py
imports: import os
  import warnings
  import numpy
  import numpy.testing
  import pytest
  from dipy.data import DATA_DIR
  from dipy.io.stateful_tractogram import Space, StatefulTractogram
  from dipy.io.utils import create_nifti_header
  from dipy.testing import check_for_warnings
  from dipy.testing.decorators import use_xvfb
  from dipy.tracking.streamline import Streamlines
  from dipy.utils.optpkg import optional_package
  from dipy.testing.decorators import set_random_number_generator
label_desc: Use image node_id 5 for calling a global function with example usage: test_small_horizon_import() without return types